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Teens at centre of Stephen Dudley’s death are ashamed of their actions.

The teenager who landed the blow that knocked Stephen Dudley to the ground feels like a coward.

He often cries with shame, and so does his younger brother.

"I feel like Stephen is dead because of me," the older boy wrote in an affidavit obtained by the Herald on Sunday. "I also feel really bad for not properly checking to make sure Stephen really was okay when we left ... I was a coward. And I still feel ashamed when I think about it."

The two brothers, aged 18 and 16, were discharged without conviction in the High Court at Auckland after admitting the assault. Their names are permanently suppressed.

The Crown Law Office is reviewing whether to appeal and a decision is expected by the end of the week.

The Dudleys are also considering a private prosecution.

Yesterday people marched in West Auckland in support of "justice for Stephen". His mother, Mona Dudley, and his siblings turned out to watch.

Organiser James Kelland, who created the Facebook page "Give Stephen his justice", told the Herald on Sunday: "The march went great. Myself and the Dudley family were overwhelmed at how many people showed up and cheered us on."

Stephen, 15, died at Auckland City Hospital after a fight at school rugby training on June 6 last year.

He had an undiagnosed heart condition that made him vulnerable to a fatal arrhythmia during traumatic stress, which is what caused his death.